The Awesome 3.5″ Navy USN Chiefs Pride “EL JEFE CPO Mess Challenge Coin E7 is a military collectible featuring the emblem of the US Navy. This original challenge coin is a symbol of pride and honor for Chiefs Petty Officers (CPOs) and is designed to be a unique keepsake for those who have served in the Navy. With its militaria theme and specific CPO challenge coin refinement, this item is a special piece for any military enthusiast or collector looking to add a piece of Navy history to their collection.